Telephone-transmitter



(No Model.)

J. W. BONTA.

TELEPHONE TRANSMITTER.

Patented July 5; 1887.

L VVENTOR Jim/a WATTORNEY NITED STATES ATENT amen.

JAMES \V. BONTA, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN NATIONAL TELEPHONE COMPANY, OF NEW YORK.

TELEPHONEQTRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 365,778, dated July 5, 1887.

Application filed December 21, 1886.

T aZZ whom it 72mg concern:

Be it known that I, JAMES W. BONTA, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and Stateof Pennsylvania, have invented certain new and useful Improvements in Telephonic Transmitters, of which the following is a specification, reference being had therein to the accompanying drawings, 'wherein- Figures 1 and 2 are vertical sections of telephonic transmitters embodying my improvements.

My invention has relation to telephonic transmitters having carbon or analogous elec- 1 trodes; and it has for its object simplicity of construction for maintaining efficient initial contact for the electrodes and for varying their contact-pressure.

My invention accordingly consists of the 2 combination, construction, and arrangement of parts, as hereinafter described and claimed, having reference particularly to an electrode contacting with the diaphragm,which is either fixed or hinged, a loose or moving pivotal 2 5 connection for the electrode,which connection is located below the body or massof the electrode, and spring-pressure devices having tension mechanism whose lines of force approximate a right angle for giving an initial con- 0 tact to the electrodes and for varying the same.

In the drawings, A represents a suitable box or casing having a removable cap, a, mouthpiece a, and diaphragm B, which is either fixed, as shown in Fig. 1, and provided with an electrode, 1), or is hinged to the casing A, as indicated at b, Fig. 2, in which case it is preferably a carbon plate, and the electrode 0 contacts directly therewith.

The electrode 0 is attached to a right-angled bar, a, which is pivoted at c in a bracket, D. The pivoted connections or bearings are preferably slots in bracket D, as shown at d, to provide for a movement of electrode 0 to 5 the diaphragm. The pivot of electrodeO is located below it, so that its gravity tends to move it toward the diaphragm.

To bar 0 is attached a vertical bar or plate spring, E, and a corresponding horizontally- Serial No. 222,180. (No model.)

arranged spring, F, the point of attachment of both springs E and F to bar 0 being the same, as shown.

The spring E has a tcnsionscrew, e, in a bracket, 6, secured to casing A, which tenf, aiiixed to casing A, and this tensionserew is above the spring F, which imparts an up ward pressure to electrode 0 for keeping it in its normal or contaeting'position with the dia phragm or its electrode 1).

The combined effect of these described ten- 6 sion-spring devices for electrode 0 is to keep it in contact with the diaphragm, and by adjusting tension-screws e and f any degree initial contact may obtained and varied, as desired. The electrodes are in the primary 1 of an inductorium, I, in which primary is a bat tery, 2, and the secondary 3 of the inductorium forms part of theline.

What I claim is- 1. In a telephonictransmitter,a diaphragmelectrode, an electrode, 0, attached to a rightangled arm or bar, 0, having loose pivotal connections below the electrode, a vertical spring, E, a horizontal spring, F, having a common point of attachment to arm 0, and tension devices for said springs, substantially as set forth.

2. In atelephonic transmitter, a hinged carbon-plate diaphragm, an electrode, 0, in contact with said diaphragm, a right-angled bar or arm attached to electrode O and loosely pivoted below the latter a vertical platespring and a horizontal plate-spring attached to said pivoted bar or arm, and tension dcvices for said springs, substantially as set go forth.

Iii-testimony whereof I affix my signature in presence ofv two witnesses.

JAMES WV. BONTA.

WVitnesscs:

S. J VAN Sravoann, J. DANIEL EBY. 

